The first cam should be OK with your set up because of the size of your engine and the low rear end gears without the converter change. It is personally a bit big for my taste for the street. I have a 383 with performer RPM heads matching intake, headers, ect. The cam I used is 230/230 @ .050 with .500 lift, 108 LSA , and it makes an honest 450+ at the crank. I am running a stock converter and it still has enough torque to destroy the tires rolling off idle in my 68 Camaro with 373 gears. I do want to change the converter to about 2200 rpm stall because it idles a bit rough in gear, not because it lacks torque.

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